Vibration-reducing structure for four-compression-chamber diaphragm pump

ABSTRACT

A vibration-reducing structure for compressing diaphragm pump features a pump head body and a diaphragm membrane. The pump head body includes four operating holes, a first curved vibration-reducing positioning structure circumferentially disposed around the upper side of each operating hole, and or a linked four-curve positioning structure that collectively extends around all of the operating holes. The diaphragm membrane includes four equivalent piston acting zones and second curved vibration-reducing position structures situated at positions corresponding to the positions of the first curved vibration-reducing positioning structures. The first positioning structures in the pump head body, which may be grooves, slots, perforations, or protrusions, mate with the corresponding second positioning structures in the diaphragm membrane to reduce the moment arm generated during pumping by movement of the diaphragm membrane, which may be protrusions, grooves, slots, or perforations, thereby generating less torque to decrease the strength of vibrations and vibration noise.

This application claims the benefit of provisional U.S. Patent Application No. 61/000,622, filed May 20, 2014, and incorporated herein by reference.

FIELD OF THE PRESENT INVENTION

The present invention relates to a vibration-reducing structure for a four-compression-chamber diaphragm pump, and particularly to a structure that can reduce the vibration strength of the pump so that the annoying noise incurred by the consonant vibration with the housing of an RO purification system is eliminated when the vibration-reducing structure is installed on the water supplying apparatus in either a house, recreational vehicle, or mobile home.

BACKGROUND OF THE INVENTION

Conventional compressing diaphragm pumps of the type used with a RO (Reverse Osmosis) purifier or RO water purification system, and which are popularly installed on the water supplying apparatus of houses, recreational vehicles or mobile homes, come in various types. Other than the specific type disclosed in U.S. Pat. No. 6,840,745, the majority of conventional four-compression-chamber diaphragm pumps can be categorized as similar in design to the one shown in FIGS. 1 through 9. The conventional four-compressing-chamber diaphragm pump shown therein essentially comprises a motor 10 with an output shaft 11, an motor upper chassis 30, a wobble plate with an integral protruding cam-lobed shaft 40, an eccentric roundel mount 50, a pump head body 60, a diaphragm membrane 70, four pumping pistons 80, a piston valvular assembly 90 and a pump head cover 20.

The motor upper chassis 30 includes a bearing 31 through which an output shaft 11 of the motor 10 extends. The motor upper chassis 30 also includes an upper annular rib ring 32 with several fastening bores 33 evenly and circumferentially disposed in a rim of the upper annular rib ring 32.

The wobble plate 40 includes a shaft coupling hole 41 through which the corresponding motor output shaft 11 of the motor 10 extends.

The eccentric roundel mount 50 includes a central bearing 51 at the bottom thereof for receiving the corresponding wobble plate 40. Four eccentric roundels 52 even and circumferentially disposed on the eccentric roundel mount 50. Each eccentric roundel 52 has a screw-threaded bore 54 and an annular positioning groove 55 formed in the top face thereof respectively.

The pump head body 60 covers the upper annular rib ring 32 of the motor upper chassis 30 to encompass the wobble plate 40 with integral protruding cam-lobed shaft and eccentric roundel mount 50 therein, and includes four operating holes 61 evenly and circumferentially disposed therein. Each operating hole 61 has an inner diameter that is slightly bigger than the outer diameter of each corresponding eccentric roundel 52 in the eccentric roundel mount 50 for receiving each corresponding eccentric roundel 52 respectively, a lower annular flange 62 formed thereunder for mating with corresponding upper annular rib ring 32 of the motor upper chassis 30, and several fastening bores 63 evenly disposed around a circumference of the pump head body 60.

The diaphragm membrane 70, which is extrusion-molded from a semi-rigid elastic material and placed on the pump head body 60, includes a pair of parallel rims, including outer raised rim 71 and inner raised rim 72, as well as four evenly spaced radial raised partition ribs 73. Each end of respective radial raised partition ribs 73 connect with the inner raised rim 72, thereby forming four equivalent piston acting zones 74 within the radial raised partition ribs 73, wherein each piston acting zone 74 has an acting zone hole 75 created therein in correspondence with a respective screw-threaded bore 54 in the screw-threaded bore 53 of the eccentric roundel mount 50, and an annular positioning protrusion 76 for each acting zone hole 75 is formed at the bottom side of the diaphragm membrane 70 (as shown in FIGS. 7 and 8).

Each pumping piston 80, which is respectively disposed in each corresponding piston acting zones 74 of the diaphragm membrane 70, has a tiered hole 81 extending therethrough. After each of the annular positioning protrusions 76 in the diaphragm membrane 70 has been inserted into each corresponding annular positioning groove 55 in the eccentric roundel 52 of the eccentric roundel mount 50, respective fastening screws 1 are inserted through the tiered hole 81 of each pumping piston 80 and the acting zone hole 75 of each corresponding piston acting zone 74 in the diaphragm membrane 70, so that the diaphragm membrane 70 and four pumping pistons 80 can be securely screwed into screw-threaded bores 54 of the corresponding four eccentric roundels 52 in the eccentric roundel mount 50 (as can be seen in the enlarged portion of FIG. 9).

Piston valvular assembly 90, which suitably covers the diaphragm membrane 70, includes a downwardly extending raised rim 91 for insertion between the outer raised rim 71 and inner raised rim 72 of the diaphragm membrane 70, a central round outlet mount 92 having a central positioning bore 93 with four equivalent sectors, each of which contains a group of multiple evenly circumferentially-located outlet ports 95, a T-shaped plastic anti-backflow valve 94 with a central positioning shank, and four circumferentially-adjacent inlet mounts 96. Each of the inlet mounts 96 includes a group of multiple evenly circumferentially-located inlet ports 97 and an inverted central piston disk 98 respectively so that each piston disk 98 serves as a valve for each corresponding group of multiple inlet ports 97, wherein the central positioning shank of the plastic anti-backflow valve 94 mates with the central positioning bore 93 of the central outlet mount 92 and the group of multiple outlet ports 95 in the central round outlet mount 92 are communicable with the four inlet mounts 96. A hermetically-sealed preliminary-compression chamber 26 is formed in each inlet mount 96 and corresponding piston acting zone 74 in the diaphragm membrane 70 when downwardly extending rim 91 is inserted between the outer raised rim 71 and inner raised rim 72 of the diaphragm membrane 70, such that one end of each preliminary-compression chamber 26 is communicable with each corresponding group of multiple inlet ports 97 (as shown in the enlarged portion of FIG. 9).

The pump head cover 20, which covers the pump head body 60 to encompass the piston valvular assembly 90, pumping piston 80 and diaphragm membrane 70 therein, includes a water inlet orifice 21, a water outlet orifice 22, and several fastening bores 23. A tiered rim 24 and an annular rib ring 25 are disposed in the bottom inside of the pump head cover 20 such that the outer rim for the assembly of diaphragm membrane 70 and piston valvular assembly 90 can be hermetically attached to the tiered rim 24 (as shown in the enlarged portion of FIG. 9). A high-compression chamber 27 is configured between the cavity formed by the inside wall of the annular rib ring 25 and the central outlet mount 92 of the piston valvular assembly 90 by means of matching the bottom of the annular rib ring 25 and the rim of the central outlet mount 92 (as shown in FIG. 9).

By running each fastening bolt 2 through each corresponding fastening bore 23 of pump head cover 20 and each corresponding fastening bore 63 in the pump head body 60, and then putting a nut 3 onto each fastening bolt 2 to securely screw the pump head cover 20 to the pump head body 60, the whole assembly of the four-compression-chamber diaphragm pump is finished (as shown in FIGS. 1 and 9).

FIGS. 10 and 11 are illustrative figures showing a practical operation mode for the conventional four-compression-chamber diaphragm pump of FIGS. 1-9.

Firstly, when the motor 10 is powered on, the wobble plate 40 is driven to rotate by the motor output shaft 11 so that the four eccentric roundels 52 on the eccentric roundel mount 50 sequentially and constantly move in an up-and-down reciprocal stroke.

Secondly, in the meantime, the four pumping pistons 80 and four piston acting zones 73 in the diaphragm membrane 70 are sequentially driven by the up-and-down reciprocal stroke of the four eccentric roundels 52 to move in an up-and-down displacement.

Thirdly, when the eccentric roundel 52 moves in a down stroke, causing pumping piston 80 and piston acting zone 74 to be displaced downwardly, the piston disk 98 in the piston valvular assembly 90 is pushed into an open status so that tap water W can flow into the preliminary-compression chamber 26 via water inlet orifice 21 in the pump head cover 20 and inlet ports 97 in the piston valvular assembly 90 (as indicated by the arrowhead extending from W in the enlarged view of FIG. 10).

Fourthly, when the eccentric roundel 52 moves in an up stroke, causing pumping piston 80 and piston acting zone 74 to be displaced upwardly, the piston disk 96 in the piston valvular assembly 90 is pulled into a closed status to compress the tap water W in the preliminary-compression chamber 26 and increase the water pressure therein up to a range of 80 psi-100 psi. The resulting pressurized water Wp causes the plastic anti-backflow valve 94 in the piston valvular assembly 90 to be pushed to an open status.

Fifthly, when the plastic anti-backflow valve 94 in the piston valvular assembly 90 is pushed to an open status, the pressurized water Wp in the preliminary-compression chamber 26 is directed into high-compression chamber 27 via the group of outlet ports 95 for the corresponding sector in the central outlet mount 92, and then expelled out of the water outlet orifice 22 in the pump head cover 20 (as shown in FIG. 11 and indicated by arrowhead Wp).

Finally, orderly iterative action for each group of outlet ports 95 for the four sectors in central outlet mount 92 causes the pressurized water Wp to be constantly discharged out of the conventional four-compression-chamber diaphragm pump to be further RO-filtered by the RO-cartridge so that the final filtered pressurized water Wp can be used in a reverse osmosis water purification system.

Referring to FIGS. 12 through 13, a serious vibration-related drawback has long existed in the above-described conventional four-compression-chamber diaphragm pump. As described previously, when the motor 10 is powered on, the wobble plate 40 is driven to rotate by the motor output shaft 11 so that four eccentric roundels 52 on the eccentric roundel mount 50 constantly and sequentially move in an up-and-down reciprocal stroke, and in the meantime four pumping pistons 80 and four piston acting zones 74 in the diaphragm membrane 70 are sequentially driven by the up-and-down reciprocal stroke of four eccentric roundels 52 to move in an up-and-down displacement so that an equivalent force F constantly acts on the four piston acting zones 74 with a length of moment arm L1 measured from the outer raised rim 71 to the periphery of the annular positioning protrusion 76 (as shown in FIG. 13). Thereby, a resultant torque is created by the acting force F, multiplying the length of moment arm L1 as shown by the formula “torque=acting force F×length of moment arm L1.” The resultant torque causes the whole conventional four-compressing-chamber diaphragm pump to vibrate directly. With a high rotational speed of the motor output shaft 11 in the motor 10 up to a range of 800-1200 rpm, the vibrating strength caused by alternate acting of the four eccentric roundels 52 can reach a persistently unacceptable condition.

To address the direct-vibration drawbacks of the conventional four-compression-chamber diaphragm pump, as shown in FIG. 14, a cushion base 100 with a pair of wing plates 101 is always provided as a supplemental support. Each wing plate 101 is further sleeved by a rubber shock absorber 102 for vibration suppressing enhancement. Upon installation of the conventional four-compression-chamber diaphragm pump in the water supplying apparatus of a house, recreational vehicle or mobile home, the cushion base 100 is firmly screwed onto the housing C of the reverse osmosis purification unit by means of suitable fastening screws 103 and corresponding nuts 104. However, the practical vibration suppressing efficiency of the foregoing cushion base 100 with wing plates 101 and rubber shock absorber 102 only affects the primary direct vibration, while reducing overall vibration only to a limited degree because the primary direct vibration causes a secondary vibration to occur as a result of resonant shaking of the housing C. The resonant shaking causes the overall vibration noise of the housing C of the reverse osmosis purification unit to become stronger.

In addition to the drawback of increasing overall vibration noise of the housing C, a further drawback occurs in that the water pipe P connected to the water outlet orifice 22 of the pump head cover 20 will synchronously shake in resonance with the primary vibration described above (as indicated by the broken-line depictions of water pipe P in FIGS. 14 and 14 a). This synchronous shaking of the water pipe P will result in still further drawbacks by causing other rest parts of the conventional compressing diaphragm pump to simultaneously shake. As a result, after a certain period, water leakage of the conventional compressing diaphragm pump will occur due to gradual loosening of the connection between water pipe P and water outlet orifice 22, as well as gradual loosening of the fit between other parts affected by the shaking

The additional drawbacks of overall resonant shaking and water leakage in the conventional four-compression-chamber diaphragm pump cannot be solved by the conventional way of addressing the foregoing primary vibration drawback. How to substantially reduce all the drawbacks associated with the operating vibration of the four-compression-chamber diaphragm pump has become an urgent and critical issue.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide a vibration-reducing structure for four-compressing-chamber diaphragm pump features of a pump head body and a diaphragm membrane, in which the pump head body includes four operating holes and at least one basic curved groove, slot, or perforated segment, or a curved protrusion or set of protrusions, circumferentially disposed around at least a portion of the upper side of each operating hole, and in which the diaphragm membrane includes four equivalent piston acting zones each of which has an acting zone hole, an annular positioning protrusion for each acting zone hole, and at least one basic curved protrusion or set of protrusions, or a groove, slot, or perforated segment, at least partially circumferentially disposed around each concentric annular positioning protrusion at a position corresponding to the position of each mating basic curved groove, slot, perforated segment, protrusions, or sets of protrusions in the pump head body, so that the four basic curved protrusions, sets of protrusions, grooves, slots, or perforated segments are completely inserted into or received by the corresponding four basic curved grooves, slots, perforated segments, protrusions, or sets of protrusions in the pump head body with a short length of moment arm to generate less torque, the torque being obtained by multiplying the length of the moment arm by a constant acting force. With less torque, the vibration strength of the compressing diaphragm pump is substantially reduced.

Another objective is to provide a vibration-reducing structure for four-compressing-chamber diaphragm pump features of a pump head body with at least four basic curved grooves, slots or perforated segments, or curved protrusions, and a diaphragm membrane with four basic curved protrusions, or curved grooves, slots, or perforated segments, such that the four basic curved protrusions, grooves, slots, or perforated segments are completely inserted into the corresponding four basic curved grooves, slots, perforated segments, or protrusions with a short length of moment arm that generates less torque, the torque being obtained by multiplying the length of the moment arm with a constant acting force. With less torque, the vibration strength of the compressing diaphragm pump is substantially reduced. By having the present invention installed on the housing of the reverse osmosis purification unit of a water supplying apparatus in either a house, recreational vehicle or mobile home, the housing being further cushioned by a conventional cushion base with a rubber shock absorber, the annoying noise caused by resonant shaking in the conventional compressing diaphragm pump can be completely eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective assembled view of a conventional four-compression-chamber diaphragm pump.

FIG. 2 is a perspective exploded view of a conventional four-compression-chamber diaphragm pump.

FIG. 3 is a perspective view of a pump head body for the conventional four-compression-chamber diaphragm pump.

FIG. 4 is a cross sectional view taken against the section line 4-4 from previous FIG. 3.

FIG. 5 is a top view of a pump head body for the conventional four-compression-chamber diaphragm pump.

FIG. 6 is a perspective view of a diaphragm membrane for the conventional four-compression-chamber diaphragm pump.

FIG. 7 is a cross sectional view taken against the section line 7-7 from previous FIG. 6.

FIG. 8 is a bottom view of a diaphragm membrane for the conventional four-compression-chamber diaphragm pump.

FIG. 9 is a cross sectional view taken against the section line 9-9 from previous FIG. 1.

FIG. 10 is the first operation illustrative view of a conventional four-compression-chamber diaphragm pump.

FIG. 11 is the second operation illustrative view of a conventional four-compression-chamber diaphragm pump.

FIG. 12 is the third operation illustrative view of a conventional four-compression-chamber diaphragm pump.

FIG. 13 is a partially enlarged view taken from circled-portion “a” in the enlarged view of FIG. 12.

FIG. 14 is a schematic side view showing a conventional four-compression-chamber diaphragm pump installed on a mounting base in a reverse osmosis purification system.

FIG. 14( a) is a schematic end view of the conventional four-compression-chamber diaphragm pump installed on a mounting base, as illustrated in FIG. 14.

FIG. 15 is a perspective exploded view of a the first exemplary embodiment of the present invention.

FIG. 16 is a perspective view of a pump head body in the first exemplary embodiment of the present invention.

FIG. 17 is a cross sectional view taken against the section line 17-17 from previous FIG. 16.

FIG. 18 is a top view of a pump head body in the first exemplary embodiment of the present invention.

FIG. 19 is a perspective view of a diaphragm membrane in the first exemplary embodiment of the present invention.

FIG. 20 is a cross sectional view taken against the section line 20-20 from previous FIG. 19.

FIG. 21 is a bottom view of a diaphragm membrane in the first exemplary embodiment of the present invention.

FIG. 22 is an assembled cross sectional view of the first exemplary embodiment of the present invention.

FIG. 23 is an operation illustrative view of the first exemplary embodiment of the present invention.

FIG. 24 is a partially enlarged view taken from circled-portion “a” of previous FIG. 23.

FIG. 25 is a perspective view of another pump head body in the first exemplary embodiment of the present invention.

FIG. 26 is a cross sectional view taken against the section line 26-26 from previous FIG. 25.

FIG. 27 is a cross sectional view of another pump head body and separated diaphragm membrane in the first exemplary embodiment of the present invention.

FIG. 28 is a cross sectional view of another combination of the pump head body and diaphragm membrane of FIG. 27.

FIG. 29 is a perspective view of a pump head body in the second exemplary embodiment of the present invention.

FIG. 30 is a cross sectional view taken against the section line 30-30 from previous FIG. 29.

FIG. 31 is a top view of a pump head body in the second exemplary embodiment of the present invention.

FIG. 32 is a perspective view of a diaphragm membrane in the second exemplary embodiment of the present invention.

FIG. 33 is a cross sectional view taken against the section line 33-33 from previous FIG. 32.

FIG. 34 is a bottom view of a diaphragm membrane in the second exemplary embodiment of the present invention.

FIG. 35 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the second exemplary embodiment of the present invention.

FIG. 36 is a perspective view of a another pump head body in the second exemplary embodiment of the present invention.

FIG. 37 is a cross sectional view taken against the section line 37-37 from previous FIG. 36.

FIG. 38 is a cross sectional view of another pump head body and separated diaphragm membrane in the second exemplary embodiment of the present invention.

FIG. 39 is a cross sectional view a combination of pump head body and diaphragm membrane of FIG.28.

FIG. 40 is a perspective view of a pump head body in the third exemplary embodiment of the present invention.

FIG. 41 is a cross sectional view taken against the section line 41-41 from previous FIG. 40.

FIG. 42 is a top view of a pump head body in the third exemplary embodiment of the present invention.

FIG. 43 is a perspective view of a diaphragm membrane in the third exemplary embodiment of the present invention.

FIG. 44 is a cross sectional view taken against the section line 44-44 from previous FIG. 43.

FIG. 45 is a bottom view of a diaphragm membrane in the third exemplary embodiment of the present invention.

FIG. 46 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the third exemplary embodiment of the present invention.

FIG. 47 is a perspective view of another pump head body in the third exemplary embodiment of the present invention.

FIG. 48 is a cross sectional view taken against the section line 48-48 from previous FIG. 47.

FIG. 49 is a cross sectional view of another pump head body and separated diaphragm membrane in the third exemplary embodiment of the present invention.

FIG. 50 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 49.

FIG. 51 is a perspective view of a pump head body in the fourth exemplary embodiment of the present invention.

FIG. 52 is a cross sectional view taken against the section line 52-52 from previous FIG. 51.

FIG. 53 is a top view of a pump head body in the fourth exemplary embodiment of the present invention.

FIG. 54 is a perspective view of a diaphragm membrane in the fourth exemplary embodiment of the present invention.

FIG. 55 is a cross sectional view taken against the section line of 55-55 from previous FIG. 54.

FIG. 56 is a bottom view of a diaphragm membrane in the fourth exemplary embodiment of the present invention.

FIG. 57 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the fourth exemplary embodiment of the present invention.

FIG. 58 is a perspective view of another pump head body in the fourth exemplary embodiment of the present invention.

FIG. 59 is a cross sectional view taken against the section line of 59-59 from previous FIG. 58.

FIG. 60 is a cross sectional view of another pump head body and separated diaphragm membrane in the fourth exemplary embodiment of the present invention.

FIG. 61 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 60.

FIG. 62 is a perspective view of a pump head body in the fifth exemplary embodiment of the present invention.

FIG. 63 is a cross sectional view taken against the section line 63-63 from previous FIG. 62.

FIG. 64 is a top view of a pump head body in the fifth exemplary embodiment of the present invention.

FIG. 65 is a perspective view of a diaphragm membrane in the fifth exemplary embodiment of the present invention.

FIG. 66 is a cross sectional view taken against the section line 66-66 from previous FIG. 65.

FIG. 67 is a bottom view of a diaphragm membrane in the fifth exemplary embodiment of the present invention.

FIG. 68 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the fifth exemplary embodiment of the present invention.

FIG. 69 is a perspective view of another pump head body in the fifth exemplary embodiment of the present invention.

FIG. 70 is a cross sectional view taken against the section line 70-70 from previous FIG. 69.

FIG. 71 is a cross sectional view of another pump head body and separated diaphragm membrane in the fifth exemplary embodiment of the present invention.

FIG. 72 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 71.

FIG. 73 is a perspective view of a pump head body in the sixth exemplary embodiment of the present invention.

FIG. 74 is a cross sectional view taken against the section line 74-74 from previous FIG. 73.

FIG. 75 is a top view of a pump head body in the sixth exemplary embodiment of the present invention.

FIG. 76 is a perspective view of a diaphragm membrane in the sixth exemplary embodiment of the present invention.

FIG. 77 is a cross sectional view taken against the section line 77-77 from previous FIG. 76.

FIG. 78 is a bottom view of a diaphragm membrane in the sixth exemplary embodiment of the present invention.

FIG. 79 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the sixth exemplary embodiment of the present invention.

FIG. 80 is a perspective view of another pump head body in the sixth exemplary embodiment of the present invention.

FIG. 81 is a cross sectional view taken against the section line 81-81 from previous FIG. 80.

FIG. 82 is a cross sectional view of another pump head body and separated diaphragm membrane in the sixth exemplary embodiment of the present invention.

FIG. 83 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 82.

FIG. 84 is a perspective view of a pump head body in the seventh exemplary embodiment of the present invention.

FIG. 85 is a cross sectional view taken against the section line 85-85 from previous FIG. 84.

FIG. 86 is a top view of a pump head body in the seventh exemplary embodiment of the present invention.

FIG. 87 is a perspective view of a diaphragm membrane in the seventh exemplary embodiment of the present invention.

FIG. 88 is a cross sectional view taken against the section line 88-88 from previous FIG. 87.

FIG. 89 is a bottom view of a diaphragm membrane in the seventh exemplary embodiment of the present invention.

FIG. 90 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 89.

FIG. 91 is a perspective view of a pump head body in the seventh exemplary embodiment of the present invention.

FIG. 92 is a cross sectional view taken against the section line 92-92 from previous FIG. 91.

FIG. 93 is a cross sectional view of another pump head body and separated diaphragm membrane in the seventh exemplary embodiment of the present invention.

FIG. 94 is a cross sectional view of a combination of the pump head body and diaphragm membrane of FIG. 93.

FIG. 95 is a top view of a pump head body in the eighth exemplary embodiment of the present invention.

FIG. 96 is a cross sectional view taken against the section line 96-96 from previous FIG. 95.

FIG. 97 is a bottom view of a diaphragm membrane in the eighth exemplary embodiment of the present invention.

FIG. 98 is a cross sectional view taken against the section line 98-98 from previous FIG. 97.

FIG. 99 is a cross sectional view of a combination of the pump head body and diaphragm membrane in the eighth exemplary embodiment of the present invention.

FIG. 100 is a perspective view of another pump head body in the eighth exemplary embodiment of the present invention.

FIG. 101 is a cross sectional view taken against the section line 101-101 from previous FIG. 100.

FIG. 102 is a cross sectional view of another pump head body and separated diaphragm membrane in the eighth exemplary embodiment of the present invention.

FIG. 103 is a cross sectional view of the combination of pump head body and diaphragm membrane of FIG. 102.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 15 through 22 are illustrative figures of a first exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump.

A basic curved groove 65 is circumferentially disposed around a portion of the upper side of each operating hole 61 in the pump head body 60 while a basic curved protrusion 77 is circumferentially disposed around a portion of each concentric annular positioning protrusion 76 at the bottom side of the diaphragm membrane 70 at positions corresponding to the positions of the mating basic curved grooves 65 in the pump head body 60 (as shown in FIGS. 20 and 21) so that each of the basic curved protrusions 77 at the bottom side of the diaphragm membrane 70 is completely inserted into each corresponding basic curved groove 65 in the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70, resulting in a shortened length of moment arm L2 from the basic curved protrusion 77 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 22 and associated enlarged view).

A comparison of FIGS. 23, 24, 13, 14, and 14(a), reveals practical operation results for the first exemplary embodiment, which are typical of those obtained for the various exemplary embodiments of the vibration-reducing structure of the present invention).

Comparing the operation of the conventional four-compression-chamber diaphragm pump shown in FIG. 13 to the operation of the four-compression-chamber diaphragm pump shown in FIG. 24, a length of moment arm L1 from the outer raised rim 71 to the periphery of the annular positioning protruding block 76 of the diaphragm membrane 70, as shown in FIG. 13, is shorter than a length of moment arm L2 from the basic curved protrusions 77 to the periphery of the annular positioning protruding block 76 of the diaphragm membrane 70, shown in FIG. 24.

When the resultant torque is calculated by multiplying the same acting force F by the length of moment arm, the resultant torque of the present invention represented by the embodiment illustrated in FIG. 24 is smaller than that of the conventional four-compression-chamber diaphragm pump shown in FIG. 13 since the length of moment arm L2 is shorter than the length of moment arm L1.

Because of the smaller resultant torque of the present invention, the related vibration strength is substantially reduced.

In a practical test of a prototype of the present invention, the vibration strength was reduced to less than one tenth (10%) of the vibration strength in the conventional four-compression-chamber diaphragm pump.

If the present invention is installed on the housing C of a reverse osmosis purification unit of a water supplying apparatus for a house, recreational vehicle or mobile home, such that it is also cushioned by a conventional cushion base 100 with a rubber shock absorber 102 (as shown in FIG. 14), the undesirable noise caused by resonant shaking that occurs in the conventional four-compression-chamber diaphragm pump can be completely eliminated.

As shown in FIGS. 25 and 26, in the first exemplary embodiment, each basic curved groove 65 of the pump head body 60 can be replaced by a basic curved slot 64 that extends through the pump head body 60.

As shown in FIGS. 27 and 28, in the first exemplary embodiment, each basic curved groove 65 in the pump head body 60 (shown in detail in FIGS. 16 and 17) and each corresponding basic curved protrusion 77 in the diaphragm membrane 70 (shown in detail in FIGS. 20 and 21) can be respectively replaced by a basic curved protrusion 651 in the pump head body 60 (as shown in FIG. 27) and a corresponding basic curved groove 771 in the diaphragm membrane 70 (as shown in FIG. 28) without affecting their mating condition.

Each basic curved protrusion 651 at the upper side of the pump head body 60 is completely inserted into each corresponding basic curved groove 771 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 28), with the result that a shortened length of moment arm L3 from the basic curved groove 771 to the peripheral of the annular positioning protrusion 76 in the diaphragm membrane 70 is also obtained in the operation of the present invention (as shown in FIG. 28 and the associated enlarged view), so that the newly devised contrivances of pump head body 60 and diaphragm membrane 70 have a significant effect in reducing vibration as well.

Referring to FIGS. 29 through 35, which are illustrative figures for the second exemplary embodiment of the vibration-reducing structure for a four-compression-chamber diaphragm pump of the present invention.

The four basic curved grooves 65 in the pump head body 60 shown in FIGS. 16 and 17 can be replaced by a single linked four-curve groove 68 that encompasses all four operating holes 61, as shown in FIGS. 29 through 31, while each of the four corresponding basic curved protrusions 77 in the diaphragm membrane 70 shown in FIGS. 20 through 21 can be replaced by a single linked four-curve protrusion 79 at a position corresponding to the position linked four-curved groove 68 in the pump head body 60, to encompass all four annular positioning protrusions 76 as shown in FIGS. 33 and 34.

The linked four-curve protrusion 79 at the bottom side of the diaphragm membrane 70 may be completely inserted into the corresponding linked four-curve groove 68 in the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 35 and the associated enlarged view), resulting in a relatively short length of moment arm L2 from the linked four-curve protrusion 79 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 35 and the associated enlarged view). The shortened length of the moment arm L2 has a significant effect in reducing vibration.

As shown in FIGS. 36 and 37, in the second exemplary embodiment, each linked four-curve groove 68 in the pump head body 60 can be replaced by a linked four-curve slot 641.

Alternatively, as shown in FIGS. 38 and 39, the linked four-curve groove 68 in the pump head body 60 of the second exemplary embodiment (as shown in FIGS. 29 to 31) and the corresponding linked four-curve protrusion 79 in the diaphragm membrane 70 (as shown in FIGS. 33 and 34) can be replaced by a linked four-curve protrusion 681 in the pump head body 60 (as shown in FIG. 38) and a linked four-curve groove 791 in the diaphragm membrane 70 (as shown in FIG. 38) without affecting their mating condition.

Thereby, the linked four-curve protrusion 681 at the upper side of the pump head body 60 may be completely inserted into the linked four-curve groove 791 in the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 39) to achieve a short length of moment arm

L3 from the linking four-curve groove 791 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 39 and enlarged view of association), with a resultant significant reduction in vibrations.

FIGS. 40 through 46 are illustrative figures showing a third exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump in the present invention.

A second outer curved groove 66 is further circumferentially disposed around each basic curved groove 65 in the pump head body 60 (as shown in FIGS. 40 through 42) while a second outer curved protrusion 78 is further circumferentially disposed around each basic curved protrusion 77 in the diaphragm membrane 70 at a position corresponding to a position of each mating second outer curved groove 66 in the pump head body 60 (as shown in FIGS. 44 and 45).

Thereby, each pair of basic curved protrusion 77 and second outer curved protrusion 78 at the bottom side of the diaphragm membrane 70 is able to be completely inserted into each pair of corresponding basic curved groove 65 and second outer curved groove 66 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 46 and the associated enlarged view), with the result that a short length of moment arm L2 from the basic curved protrusion 77 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 is obtained during the operation of the present invention (as shown in FIG. 46 and the associated enlarged view), thereby achieving significantly reduced vibration as well as enhanced stability in preventing displacement and maintaining the length of moment arm L2 for resisting the acting force F on the eccentric roundel 52.

As shown in FIGS. 47 and 48, in the third exemplary embodiment, each pair of basic curved groove 65 and second outer curved groove 66 of the pump head body 60 can be replaced by a pair of bores including a basic curved bore 64 and second outer curved bore 67.

Alternatively, as shown in FIGS. 49 and 50, in the third exemplary embodiment, each pair of basic curved groove 65 and second outer curved groove 66 in the pump head body 60 (as shown in FIGS. 40 to 42) and each corresponding pair of basic curved protrusion 77 and second outer curved protrusion 78 in the diaphragm membrane 70 (as shown in FIGS. 44 and 45) can be respectively exchanged for a pair of basic curved protrusion 651 and second outer curved protrusion 661 in the pump head body 60 (as shown in FIG. 49) and a pair of corresponding basic curved groove 771 and second outer curved groove 781 in the diaphragm membrane 70 (as shown in FIG. 49) without affecting their mating condition.

Thereby, each pair of basic curved protrusion 651 and second outer curved protrusion 661 at the upper side of the pump head body 60 is completely inserted into each corresponding pair of basic curved groove 771 and second outer curved groove 781 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 50), resulting in a shortened length of moment arm L3 from the basic curved groove 771 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 50 and the associated enlarged view) in order to significantly reduce vibration and provide enhanced stability in maintaining the length of moment arm L3.

FIGS. 51 through 57 are illustrative figures showing a fourth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump.

An integral annular groove 601 is circumferentially disposed around each said operating hole 61 in the pump head body 60 (as shown in FIGS. 51 through 53) while an integral protruding ring or annular protrusion 701 is circumferentially disposed around each annular positioning protrusion 76 in the diaphragm membrane 70 at a position corresponding to a position of each mating integral annular groove 601 in the pump head body 60 (as shown in FIGS. 55 and 56).

Each integral annular protrusion 701 at the bottom side of the diaphragm membrane 70 is completely inserted into each corresponding integral annular groove 601 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 57),

thereby shortening a length of moment arm L2 from the integral annular protrusion 701 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 57 and the associated enlarged view),

and consequently reducing vibration while enhancing the stability of the moment arm L2 against the acting force F on the eccentric roundel 52.

As shown in FIGS. 58 and 59, in the fourth exemplary embodiment, each integral annular groove 601 of the pump head body 60 may be replaced by an integral perforated ring 600.

Also, as shown in FIGS. 60 and 61, in the fourth exemplary embodiment, each integral annular groove 601 in the pump head body 60 (as shown in FIGS. 51 to 53) and each corresponding integral annular protrusion 701 in the diaphragm membrane 70 (as shown in FIGS. 55 and 56) may be replaced by an integral protruding ring or annular protrusion 610 in the pump head body 60 (as shown in FIG. 60) and a corresponding integral annular groove 710 in the diaphragm membrane 70 (as shown in FIG. 60) without affecting their mating condition.

Each integral annular protrusion 610 at the upper side of the pump head body 60 is completely inserted into each corresponding integral annular groove 710 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 61). As a result, a shortened length of moment arm L3 from the integral annular groove 710 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 is obtained during operation of the present invention (as shown in FIG. 61 and the associated enlarged view) and vibrations are consequently reduced.

FIGS. 62 through 68 are illustrative figures for the fifth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump of the present invention.

A group of curved grooves 602 are circumferentially disposed around each operating hole 61 in the pump head body 60 (as shown in FIGS. 62 through 64) while a group of curved protrusions 702 are circumferentially disposed around each annular positioning protrusion 76 in the diaphragm membrane 70 at a position corresponding to a position of a respective group of mating curved grooves 602 in the pump head body 60 (as shown in FIGS. 66 and 67).

Each group of curved protrusions 702 at the bottom side of the diaphragm membrane 70 is completely inserted into each corresponding group of curved dents 602 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 68), with the result that a short length of moment arm L2 from the curved protrusion 702 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 is obtained during operation of the present invention (as also shown in FIG. 68 and the associated enlarged view), resulting insignificantly reduced vibration.

As shown in FIGS. 69 and 70, in the fifth exemplary embodiment, each group of curved grooves 602 of the pump head body 60 can be replaced by a group of curved slits 611.

As shown in FIGS. 71 and 72, in the fifth exemplary embodiment, each group of curved grooves 602 in the pump head body 60 (as shown in FIGS. 62 to 64) and each corresponding group of curved protrusions 702 in the diaphragm membrane 70 (as shown in FIGS. 66 and 67) can be respectively exchanged for a group of curved protrusions 620 in the pump head body 60 (as shown in FIG. 71) and a group of corresponding curved grooves 720 in the diaphragm membrane 70 (as shown in FIG. 71) without affecting their mating condition.

Each group of curved protrusions 620 at the upper side of the pump head body 60 is completely inserted into each group of corresponding curved grooves 720 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 72), with the result that a short length of moment arm L3 from the curved dents 720 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 is also obtained in the operation of the present invention (as shown in FIG. 72 and the associated enlarged view) so that the newly devised contrivances of pump head body 60 and diaphragm membrane 70 have a significant effect in reducing vibration.

FIGS. 73 through 79 are illustrative figures for the sixth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention.

A group of round indents 603 are circumferentially disposed around each operating hole 61 in the pump head body 60 (as shown in FIGS. 73 through 75) while a group of round protrusions 703 are circumferentially disposed around each annular positioning protrusion 76 in the diaphragm membrane 70 at a position corresponding to a position each group of mating round indents 603 in the pump head body 60 (as shown in FIGS. 77 and 78).

Each group of round protrusions 703 at the bottom side of the diaphragm membrane 70 is completely inserted into each corresponding group of round indents 603 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 79), resulting in a moment arm L2 of decreased length that extends from the round protrusion 703 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 79 and the associated enlarged view), the decrease in length of the moment arm L2 having a significant effect in reducing vibration as well as preventing displacement of, and maintaining stability in the length of, moment arm L2.

As shown in FIGS. 69 and 70, in the sixth exemplary embodiment, each group of round indents 603 in the pump head body 60 may be replaced by a group of round through-holes or bores 612.

As shown in FIGS. 82 and 83, in the sixth exemplary embodiment, each group of round indents 603 in the pump head body 60 (as shown in FIGS. 73 to 75) and each corresponding group of round protrusions 703 in the diaphragm membrane 70 (as shown in FIGS. 77 and 78) may also be replaced by a group of round protrusions 630 in the pump head body 60 (as shown in FIG. 82) and a group of corresponding round indents 730 in the diaphragm membrane 70 (as shown in FIG. 82) without affecting their mating condition.

Each group of round protrusions 630 at the upper side of the pump head body 60 is completely inserted into each group of corresponding round indents 730 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 83), thereby obtaining a short length of moment arm L3 from the round dents 730 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 83 and the associated enlarged view) and consequently reducing vibration.

FIGS. 84 through 90 are illustrative figures for the seventh exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention.

A group of square indents 604 are circumferentially disposed around each operating hole 61 in the pump head body 60 (as shown in FIGS. 84 through 86) while a group of square protrusions 704 are circumferentially disposed around each annular positioning protrusion 76 in the diaphragm membrane 70 at a position corresponding to a position of each mating group of square indents 604 in the pump head body 60 (as shown in FIGS. 88 and 89).

Each group of square protrusions 704 at the bottom side of the diaphragm membrane 70 is completely inserted into each corresponding group of square indents 604 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 90) to obtain a short length of moment arm L2 from the square protrusions 704 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 60 and the associated enlarged view), the steadily maintained, displacement resistant, shortened length of the moment art L2 having a significant effect in reducing vibration.

As shown in FIGS. 91 and 92, in the seventh exemplary embodiment, each group of square indents 604 in the pump head body 60 can be replaced by a group of square holes 613.

As shown in FIGS. 93 and 94 in the seventh exemplary embodiment, each group of square indents 604 in the pump head body 60 (as shown in FIGS. 84 to 86) and each corresponding group of square protrusions 704 in the diaphragm membrane 70 (as shown in FIGS. 88 and 89) can be exchanged for a group of square protrusions 640 in the pump head body 60 (as shown in FIG. 93) and a group of corresponding square indents 740 in the diaphragm membrane 70 (as shown in FIG. 93) without affecting their mating condition.

Each group of square protrusions 640 at the upper side of the pump head body 60 is completely inserted into each group of corresponding square indents 740 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 94) thereby obtaining a short length of moment arm L3 from the square indents 740 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 94 and the associated enlarged view) and a significant reduction in vibrations.

FIGS. 95 through 99 are illustrative figures for the eighth exemplary embodiment of a vibration-reducing structure for a four-compression-chamber diaphragm pump according to the present invention.

An integral annular groove 601 is circumferentially disposed around the upper side of each operating hole 61 and a linked four-curve indent 68 is disposed to encompass all four integral indented rings 601 in the pump head body 60 (as shown in FIGS. 95 and 96) while an integral protruding ring 701 is circumferentially disposed around each concentric annular positioning protrusion 76 and a linked four-curve protrusion 79 is disposed to encompass all four integral protruding rings 701 at the bottom side of the diaphragm membrane 70 at a position corresponding to a position of the mating linked four-curve indent 68 and four integral indented rings 601 in the pump head body 60 (as shown in FIGS. 97 and 98).

The linked four-curve protrusion 79 and four integral protruding rings 701 at the bottom side of the diaphragm membrane 70 are completely inserted into the corresponding linked four-curve indent 68 and four integral indented rings 601 at the upper side of the pump head body 60 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 99 and the associated enlarged view) such that a shortened length of moment arm L2 from the integral protruding ring 701 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 is obtained during operation of the present invention (as shown in FIG. 99 and the associated enlarged view) to reduce vibrations by enhancing stability in the length of moment arm L2 and resistance against the acting force F on the eccentric roundel 52.

As shown in FIGS. 100 and 101, in the eighth exemplary embodiment, the linked four-curve indent 68 and four integral indented rings 601 in the pump head body 60 can be replaced by a linked four-curve slit 641 and four integral perforated rings 600.

As shown in FIGS. 102 and 103, in the eighth exemplary embodiment, the linked four-curve indent 68 and four integral indented rings 601 in the pump head body 60 (as shown in FIGS. 95 and 96), and the corresponding linked four-curve protrusion 79 and four integral protruding rings 701 in the diaphragm membrane 70 (as shown in FIGS. 97 and 98), can be exchanged for a linked four-curve protrusion 681 and four integral protruding rings 610 in the pump head body 60 (as shown in FIG. 102) and a corresponding linked four-curve indent 791 and four integral indented rings 710 in the diaphragm membrane 70 (as shown in FIG. 102) without affecting their mating condition.

The linking four-curve protrusion 681 and four integral protruding rings 610 at the upper side of the pump head body 60 are completely inserted into the corresponding linked four-curve indent 791 and four integral indented rings 710 at the bottom side of the diaphragm membrane 70 upon assembly of the pump head body 60 and the diaphragm membrane 70 (as shown in FIG. 103) to obtain a shortened length of moment arm L3 from the integral annular groove 710 to the periphery of the annular positioning protrusion 76 in the diaphragm membrane 70 during operation of the present invention (as shown in FIG. 103 and the associated enlarged view) and thereby significantly reduce vibrations.

Based on the foregoing disclosure, the present invention substantially achieves a vibration reducing effect in the four-compression-chamber diaphragm pump by means of simple newly devised pump head body 60 and diaphragm membrane 70 without increasing overall cost. The present invention surely resolves all issues of undesired noise and resonant shaking that result from vibrations in the conventional four-compression-chamber diaphragm pump, which has valuable industrial applicability. 

What is claimed is:
 1. A four-compression-chamber diaphragm pump with a vibration-reducing structure, wherein said four-compression-chamber diaphragm pump includes a motor, a pump head body fixed to a motor housing, a roundel mount situated on a lower side of the pump head body and four eccentric roundels that extend through four operating holes in the pump head body, a diaphragm membrane fixed to the eccentric roundels through the operating holes and situated on an upper side of the pump head body, and four pumping pistons arranged to be moved in a pumping action upon movement of the diaphragm membrane, wherein: the pump head body includes at least one first curved vibration-reducing positioning structure at each operating hole on the upper side of the pump head body, the diaphragm membrane includes at least one second curved positioning structure at a respective position on the diaphragm membrane that corresponds to a position of said at least one first vibration-reducing positioning structure on the pump head body, and the at least one first positioning structure mates with the corresponding at least one second positioning structure to reduce a moment arm generated during pumping by movement of the diaphragm membrane, thereby generating less torque during said movement to decrease a strength of vibrations and vibration noise.
 2. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein said motor includes an output shaft, and said compressing diaphragm pump further includes a wobble plate with an integral protruding cam-lobed shaft and a piston valvular assembly, and wherein: said output shaft of said motor extends through a shaft coupling hole in said wobble plate to cause said wobble plate to rotate; said integral protruding cam-lobed shaft of said wobble plate extends through a central bearing of said eccentric roundel mount; said four eccentric roundels are evenly disposed around a circumference of the eccentric roundel mount, whereby rotation of said wobble plate causes sequential up-and-down movement of each of said eccentric roundels, each eccentric roundel having a top face, a positioning groove formed in the top face, and a fastening bore formed in the top face; said pump head body is secured to an upper chassis of the said motor to encompass the wobble plate and eccentric roundel mount therein, said four operating holes in said pump head body being disposed at locations corresponding to locations of said four eccentric roundels, each operating hole having an inner diameter slightly bigger than an outer diameter of a corresponding one of said eccentric roundels for respectively receiving the corresponding one of the eccentric roundels; said diaphragm membrane is made of a semi-rigid elastic material and placed on the pump head body, said diaphragm membrane including four annular raised rims extending from a bottom side of the diaphragm membrane to mate with the respective positioning grooves in the top face of the respective four eccentric roundels, as well as four evenly spaced radial raised partition ribs extending from a top side of the diaphragm membrane to form four equivalent piston acting zones, wherein each piston acting zone has an acting zone hole formed therein at a position corresponding to a position of a fastening bore in a respective one of the eccentric roundels; each pumping piston has a tiered hole and a fastening member extends through the tiered hole of each pumping piston, through the acting zone hole of each corresponding piston acting zone in the diaphragm membrane, and into the respective fastening hole in a respective one of the eccentric roundels to secure the diaphragm membrane and each of the four pumping pistons to the corresponding four eccentric roundels in the eccentric roundel mount; said piston valvular assembly, which covers the diaphragm membrane and is peripherally secured to the diaphragm membrane by sealing engagement, includes a central outlet mount having a central positioning bore and four equivalent sectors, each of which contains multiple evenly circumferentially-located outlet ports, a T-shaped plastic anti-backflow valve with a central positioning shank, and four circumferential inlet mounts, each of the four circumferential inlet mounts including multiple evenly circumferentially-located inlet ports and an inverted central piston disk mounted to the respective inlet mount so that each piston disk serves as a valve for each corresponding group of multiple inlet ports, wherein the central positioning shank of the plastic anti-backflow valve mates with the central positioning bore of the central outlet mount such that said multiple outlet ports in the central round outlet mount communicate with the four circumferential inlet mounts, and a hermetic preliminary water-pressurizing chamber is formed in each inlet mount and corresponding piston acting zone in the diaphragm membrane upon the diaphragm membrane being peripherally secured to the piston valvular assembly such that one end of each of the preliminary water-pressuring chamber is communicable with each corresponding one of said inlet ports; said pump head cover, which covers on the pump head body to encompass the piston valvular assembly, pumping piston and diaphragm membrane therein, includes a water inlet orifice, and a water outlet orifice, said pump head cover being hermetically attached to the assembly of diaphragm membrane and piston valvular assembly, wherein a high-pressured water chamber is configured between a cavity formed by an inside wall of an annular rib ring and the central outlet mount of the piston valvular assembly; said at least one first positioning structure includes at least one of a basic curved groove, curved slot, curved set of openings, curved protrusion, and curved set of protrusions, each said first positioning structure being circumferentially-disposed around an upper side of each of the four operating holes in the pump head body or linked to extend collectively around an upper side of all of the operating holes; and said at least one second vibration-reducing positioning structure includes one of a basic curved protrusion, curved set of protrusions, curved groove, curved slot, and curved set of openings, each said at least one second positioning structure being circumferentially-disposed around each of the four annular raised rims at the bottom side of the diaphragm membrane at a position corresponding to a position of each first positioning structure in the pump head body so that each second positioning structure at the bottom side of the diaphragm membrane is mated with each corresponding first positioning structure at the upper side of the pump head body upon assembly of the pump head body and the diaphragm membrane, whereby the moment arm generated by movement of the diaphragm membrane in response to up-and-down movement of the pistons extends between the first vibration-reducing structures and a periphery of the second vibration-reducing structures to thereby reduce vibrations resulting from said movement of the diaphragm.
 3. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a curved groove or slot in the pump head body and each said second vibration-reducing positioning structure is a curved protrusion extending from the diaphragm membrane.
 4. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 3, wherein each said first vibration-reducing positioning structure includes a second curved groove or slot circumferentially disposed around the first groove or slot in the pump head body and each said second vibration-reducing positioning structure includes a second curved protrusion circumferentially disposed around the first curved protrusion extending from the diaphragm membrane.
 5. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a curved protrusion extending from the pump head body and each said second vibration-reducing positioning structure is a curved groove or slot extending from the diaphragm membrane.
 6. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 5, wherein each said first vibration-reducing positioning structure includes a second curved protrusion circumferentially disposed around the first curved protrusion extending from the pump head body and each said second vibration-reducing positioning structure includes a second curved groove or slot circumferentially disposed around the first curved groove or slot in the diaphragm membrane.
 7. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein said first vibration-reducing positioning structures are combined to form a linked four-curve groove or slot in the pump head body and said second vibration-reducing positioning structures are combined to form a linked four-curve protrusion extending from the diaphragm membrane.
 8. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein said first vibration-reducing positioning structures are combined to form a linked four-curve protrusion extending from the pump head body and said second vibration-reducing positioning structures are combined to form a linked four-curve groove or slot in the diaphragm membrane.
 9. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure includes an annular groove or perforated ring in the pump head body and each said second vibration-reducing positioning structure includes a curved protrusion or set of protrusions extending from the diaphragm membrane.
 10. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 9, wherein said first vibration-reducing positioning structure further includes a linked four-curve protrusion extending from the pump head body and around all four of said operating holes and corresponding annular grooves or perforated rings, and wherein said second vibration-reducing positioning structure further includes a linked four-curve groove or slot in the diaphragm membrane that extends around all four of said raised rims and curved protrusions or sets of protrusions extending from the diaphragm membrane.
 11. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure includes a curved protrusion or set of protrusions extending from the pump head body and each said second vibration-reducing positioning structure includes an annular groove or perforated ring in the diaphragm membrane.
 12. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 11, wherein said first vibration-reducing positioning structure further includes a linked four-curve protrusion extending from the pump head body and around all four of said raised rims and corresponding curved protrusions or sets of protrusions, and wherein said second vibration-reducing positioning structure further includes a linked four-curve groove or slot in the diaphragm membrane that extends around all four of said operating holes and annular grooves or perforated rings in the diaphragm membrane.
 13. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of curved grooves or slots in the pump head body and each said second vibration-reducing positioning structure is a set of curved protrusions extending from the diaphragm membrane.
 14. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of curved protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of curved grooves or slots in the diaphragm membrane.
 15. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of round indents or holes in the pump head body and each said second vibration-reducing positioning structure is a set of round protrusions extending from the diaphragm membrane.
 16. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of round protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of round indents or holes in the diaphragm membrane.
 17. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of square indents or holes in the pump head body and each said second vibration-reducing positioning structure is a set of square protrusions extending from the diaphragm membrane.
 18. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein each said first vibration-reducing positioning structure is a set of square protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of square indents or holes in the diaphragm membrane.
 19. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein said diaphragm membrane includes an inner raised rim and a parallel outer raised rim extending from a top of said diaphragm membrane, said piston valvular assembly includes a downwardly extending raised rim, and said to downwardly extending raised rim of said piston valvular assembly extends between said inner and outer raised rims of said diaphragm membrane to provide a peripheral seal when said diaphragm membrane is peripherally secured to said piston valvular assembly.
 20. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein said fastening bores in said eccentric roundels are threaded bores and said fastening members are screws.
 21. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 2, wherein said cavity is formed by a bottom of an annular rib ring of the pump head cover being pressed onto a rim of the central outlet mount of the piston valvular assembly.
 22. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a curved groove or slot in the pump head body and each said second vibration-reducing positioning structure is a curved protrusion extending from the diaphragm membrane.
 23. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 22, wherein each said first vibration-reducing positioning structure includes a second curved groove or slot circumferentially disposed around the first groove or slot in the pump head body and each said second vibration-reducing positioning structure includes a second curved protrusion circumferentially disposed around the first curved protrusion extending from the diaphragm membrane.
 24. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a curved protrusion extending from the pump head body and each said second vibration-reducing positioning structure is a curved groove or slot extending from the diaphragm membrane.
 25. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 24, wherein each said first vibration-reducing positioning structure includes a second curved protrusion circumferentially disposed around the first curved protrusion extending from the pump head body and each said second vibration-reducing positioning structure includes a second curved groove or slot circumferentially disposed around the first curved groove or slot in the diaphragm membrane.
 26. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein said first vibration-reducing positioning structures are combined to form a linked four-curve groove or slot in the pump head body and said second vibration-reducing positioning structures are combined to form a linked four-curve protrusion extending from the diaphragm membrane.
 27. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein said first vibration-reducing positioning structures are combined to form a linked four-curve protrusion extending from the pump head body and said second vibration-reducing positioning structures are combined to form a linked four-curve groove or slot in the diaphragm membrane.
 28. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure includes an annular groove or perforated ring in the pump head body and each said second vibration-reducing positioning structure includes a curved protrusion or set of protrusions extending from the diaphragm membrane.
 29. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 28, wherein said first vibration-reducing positioning structure further includes a linked four-curve protrusion extending from the pump head body and around all four of said operating holes and corresponding annular grooves or perforated rings, and wherein said second vibration-reducing positioning structure further includes a linked four-curve groove or slot in the diaphragm membrane that extends around all four of said curved protrusions or sets of protrusions extending from the diaphragm membrane.
 30. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure includes a curved protrusion or set of protrusions extending from the pump head body and each said second vibration-reducing positioning structure includes an annular groove or perforated ring in the diaphragm membrane.
 31. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 30, wherein said first vibration-reducing positioning structure further includes a linked four-curve protrusion extending from the pump head body and around all four of said operating holes and corresponding curved protrusions or sets of protrusions, and wherein said second vibration-reducing positioning structure further includes a linked four-curve groove or slot in the diaphragm membrane that extends around all four of said annular grooves or perforated rings in the diaphragm membrane.
 32. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of curved grooves or slots in the pump head body and each said second vibration-reducing positioning structure is a set of curved protrusions extending from the diaphragm membrane.
 33. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of curved protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of curved grooves or slots in the diaphragm membrane.
 34. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of round indents or holes in the pump head body and each said second vibration-reducing positioning structure is a set of round protrusions extending from the diaphragm membrane.
 35. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of round protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of round indents or holes in the diaphragm membrane.
 36. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of square indents or holes in the pump head body and each said second vibration-reducing positioning structure is a set of square protrusions extending from the diaphragm membrane.
 37. A four-compression-chamber diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein each said first vibration-reducing positioning structure is a set of square protrusions extending from the pump head body and each said second vibration-reducing positioning structure is a set of square indents or holes in the diaphragm membrane.
 38. The compressing diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein said motor is a brushed motor.
 39. The compressing diaphragm pump with a vibration-reducing structure as claimed in claim 1, wherein said motor is a brushless motor. 